Zeyu Ning, Zhuo Wang, Ting Zhao, Ronghui Ye, Jinteng Kang, Zhuang Liu, JiaoJiao Wang
{"title":"Polyetherimide copolymer film with room-temperature self-healing properties and high breakdown field strength","authors":"Zeyu Ning, Zhuo Wang, Ting Zhao, Ronghui Ye, Jinteng Kang, Zhuang Liu, JiaoJiao Wang","doi":"10.1016/j.ceramint.2024.10.252","DOIUrl":"10.1016/j.ceramint.2024.10.252","url":null,"abstract":"<div><div>With the waste of resources caused by human activities, it has gradually become an increasingly prominent social problem. The development of self-healing polymers in the field of insulation has attracted widespread attention. Develop polymer matrices with efficient healing efficiency and sound insulation properties to achieve green and sustainable resource conservation. In addition, improving the dielectric properties of intrinsic self-healing matrices has been a hot topic. In this work, we developed a new PEI matrix-modified self-healing polymer substrate that provides a breakdown field strength of 240 kV/mm and self-healing properties at room temperature, this has significantly improved the dielectric properties over other previously reported self-healing polymers. In addition to the abovementioned performance, we found significant differences in thermodynamic behavior in the synthesized end-modified polymers. By dielectric characterization (LCR), the breakdown composite can be left at room temperature for 60 min, and the material can recover 80 % of the initial properties without external intervention(This is demonstrated by the fact that its DC conductivity at 60 min of autonomous healing was significantly changed from that of the freshly electrically pierced DC conductivity and remained around 5.38 × 10<sup>−11</sup> S/cm for a longer period of time thereafter). The microscopic morphology of the modified PEI matrix was observed by scanning electron microscopy (SEM) and EDS surface elemental analysis, which further supports the existence of metal coordination structures. These findings can further deepen the thinking of self-healing dielectric composites. The work inspired by this may break the limits and take self-healing composite dielectric materials to a new height.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 52152-52157"},"PeriodicalIF":5.1,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lulu Xu , Yuzhou Pan , Guanghui Wang , Fajian He , Shixun Dai
{"title":"High-efficiency 1.6 μm-band fiber laser based on single Er3+-doped tungsten tellurite glass with high mechanical strength through tailored glass network","authors":"Lulu Xu , Yuzhou Pan , Guanghui Wang , Fajian He , Shixun Dai","doi":"10.1016/j.ceramint.2024.09.225","DOIUrl":"10.1016/j.ceramint.2024.09.225","url":null,"abstract":"<div><div>In this study, the correlation between the Raman structure, thermal stability, and mechanical properties of TeO<sub>2</sub>-ZnO-La<sub>2</sub>O<sub>3</sub>–WO<sub>3</sub> glasses with varying WO<sub>3</sub> contents are systematically established. By exploring the critical point in the transformation process of glass network structural units, the optimal glass components of 74TeO<sub>2</sub>-12ZnO-5La<sub>2</sub>O<sub>3</sub>–9WO<sub>3</sub> glass possess the maximum thermal stability (158 °C) and the highest mechanical properties at the same time. The maximum Vicker hardness and Young's modulus of the optimal glass can reach up to 4.007 GPa and 56.212 GPa, which are higher than those of the well-known TeO<sub>2</sub>-ZnO-Na<sub>2</sub>O (TZN) and TeO<sub>2</sub>-ZnO-La<sub>2</sub>O<sub>3</sub> (TZL) glasses. Furthermore, the 0.5 mol% Er<sup>3+</sup>-doped glass at this critical point (TZLW-0.5Er) exhibits a higher laser figure of merit (54.29 × 10<sup>−21</sup> cm<sup>2</sup> ms), a larger laser gain bandwidth value (116 nm) and higher emission cross-sections at 1600 nm (2.52 × 10<sup>−21</sup> cm<sup>2</sup>) and 1625 nm (1.06 × 10<sup>−21</sup> cm<sup>2</sup>) than other host glasses. Finally, high-efficiency laser outputs at 1600 and 1625 nm based on TZLW-0.5Er glass fiber are successfully achieved by simulation. These results show the greater practical potential of TZLW-0.5Er glass with higher mechanical strength compared to TZN and TZL fibers for the 1.6 μm-band laser.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 48977-48987"},"PeriodicalIF":5.1,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Effect of epoxy resin addition on the acoustic impedance, microstructure, dielectric and piezoelectric properties of 1–3 connectivity lead-free barium zirconate titanate ceramic cement-based composites","authors":"Thanyapon Wittinanon , Rattiyakorn Rianyoi , Ruamporn Potong , Arnon Chaipanich","doi":"10.1016/j.ceramint.2024.10.251","DOIUrl":"10.1016/j.ceramint.2024.10.251","url":null,"abstract":"<div><div>In this work, 1–3 connectivity barium zirconate titanate ceramic cement-based composites were fabricated using Portland cement and epoxy resin as the matrix. Barium zirconate titanate (BZT) of 40–60 % by volume was used while epoxy was used with cement at 0–7% by volume. Dielectric and piezoelectric properties, and other properties such as acoustic impedance, density and microstructure were investigated. It was found that epoxy resin can be used in combination with BZT to achieve a suitable acoustic impedance value (9–11 × 10<sup>6</sup> kg/m·s<sup>2</sup>) matching that of concrete for structural health monitoring application. Thus, when epoxy resin was used at 7 %, BZT volume can be increased to 60 % where the highest d<sub>33</sub> value of 93 pC/N was found and remain within the acoustic matching range. In addition, when epoxy resin was increased, both piezoelectric charge coefficient (d<sub>33</sub>) and piezoelectric voltage coefficient (g<sub>33</sub>) were also found to increase. This is likely due to the lower porosity thus denser matrix when epoxy resin was used in addition to cement.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 52144-52151"},"PeriodicalIF":5.1,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yiwen Pu , Le Li, Junbo Xia, Nana Jia, Shifeng Jia, Wei Ren
{"title":"Rapid fabrication of Ba1–xSrxTiO3 ceramics via reactive flash sintering","authors":"Yiwen Pu , Le Li, Junbo Xia, Nana Jia, Shifeng Jia, Wei Ren","doi":"10.1016/j.ceramint.2024.10.044","DOIUrl":"10.1016/j.ceramint.2024.10.044","url":null,"abstract":"<div><div>Ba<sub>1–<em>x</em></sub>Sr<sub><em>x</em></sub>TiO<sub>3</sub> (BST) ceramics are promising dielectric materials. However, their fabrication is usually laborious, requiring long preparation stages and high temperatures, which are not favorable for tuning the grain size and dielectric properties. In this study, (Ba<sub>1–<em>x</em></sub>Sr<sub><em>x</em></sub>)TiO<sub>3</sub> (<em>x</em> = 0.1, 0.3, 0.5) ceramics were produced via reactive flash sintering (RFS) of a mixture of BaCO<sub>3</sub>, SrCO<sub>3</sub> and TiO<sub>2</sub> powders at 900 °C and relatively short times (15–90 s). The electric field (E-field) with a strength of 400 V/cm and the current densities of 25–75 mA mm<sup>−2</sup> were applied during RFS. Once the Sr<sup>2+</sup> content increased, the incubation time for the RFS decreased, suggesting that the addition of Sr<sup>2+</sup> facilitated the RFS process. At the RFS time above 15 s, a single-phase Ba<sub>0.6</sub>Sr<sub>0.4</sub>TiO<sub>3</sub> perovskite structure was formed. When the time and the applied current density increased, both the densities and grain sizes within the ceramics increased. This increased the real part (<em>ε</em>’) of the complex permittivity compared to that of the conventionally sintered (CS) ceramic. Moreover, the enhancement of mass transport by E-field-induced oxygen vacancies was considered the predominant mechanism of RFS in the production of BST ceramics.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 51284-51288"},"PeriodicalIF":5.1,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Vadim Zhmykhov , Denis Guryev , Vladimir S. Tsvetkov , Yurii Pyrkov , Anastasia Shvedchenko , Elena Dobretsova , Sergey Kuznetsov , Marina Nikova , Vitaly Tarala , Vladimir B. Tsvetkov
{"title":"Yb:YSAG ceramics: An attractive thin-disk laser material alternative to a single crystal?","authors":"Vadim Zhmykhov , Denis Guryev , Vladimir S. Tsvetkov , Yurii Pyrkov , Anastasia Shvedchenko , Elena Dobretsova , Sergey Kuznetsov , Marina Nikova , Vitaly Tarala , Vladimir B. Tsvetkov","doi":"10.1016/j.ceramint.2024.09.381","DOIUrl":"10.1016/j.ceramint.2024.09.381","url":null,"abstract":"<div><div>The 8.3 at.% Yb-doped yttrium-scandium-aluminum garnet (YSAG) ceramics were fabricated by a modified reverse co-precipitation method followed by uniaxial and cold isostatic pressing, annealing in air and high-temperature sintering in vacuum. Spectroscopic and lasing properties were investigated in dependence on Y/Sc/Al ratio in ceramic composition. Optical transmission of Yb:YSAG ceramics in visible and near-infrared spectral range exceeds 80 % that indicates a high quality of the Yb:YSAG samples. Among all the ceramics, the Y<sub>2.35</sub>Yb<sub>0.25</sub>Sc<sub>1.00</sub>Al<sub>4.40</sub>O<sub>12</sub> composition demonstrates the best lasing performance and the highest slope efficiency up to 75 %.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 50358-50366"},"PeriodicalIF":5.1,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kai Wang , Yunkai Zhao , Xuefang Chen , Ruiqing Chu , Guorong Li , Zhijun Xu
{"title":"Effects of sintering temperature on microstructure and varistor performances of ZnO-SrCO3-Co2O3 ceramics","authors":"Kai Wang , Yunkai Zhao , Xuefang Chen , Ruiqing Chu , Guorong Li , Zhijun Xu","doi":"10.1016/j.ceramint.2024.10.031","DOIUrl":"10.1016/j.ceramint.2024.10.031","url":null,"abstract":"<div><div>Sintering temperature is decisive for optimizing the grain boundary environment to obtain the high performance ZnO based varistor ceramic. In this work, the impacts of sintering temperature on microstructure and electrical properties of ternary Zn-Sr-Co varistor were investigated. It was found that the distribution of Sr, the critical factor to form grain boundary, was heavily sensitive to sintering temperature. The considerable Sr ions precipitated at grain boundaries and formed the clusters of SrZnO<sub>2</sub> while the sintering temperature increases from 1150 °C to 1190 °C. Besides, the precipitation of Sr led to the large segregation of Co at grain boundaries. The enrichment behavior of Sr and Co contributed to the optimization of grain boundaries, resulting in the enhanced barrier height. As a result, the excellent nonlinear current-voltage performances, i.e., the high nonlinear coefficient of 56.47 and the low leakage current density of 0.73 μA/cm<sup>2</sup> were obtained in the ternary ZnO-SrCO<sub>3</sub>-Co<sub>2</sub>O<sub>3</sub> varistor sintered at 1190 °C. However, the grain boundary environment would be destroyed by the excessive temperature of 1210 °C, resulting in the degradation of grain boundary barrier and especially a surge in the leakage current I<sub>L</sub> from 0.73 to 92.19 μA/cm<sup>2</sup>. In addition, varying sintering temperature has the important effects on impedance and dielectric properties of the ZnO-SrCO<sub>3</sub>-Co<sub>2</sub>O<sub>3</sub> varistors. The findings provide new perspectives for developing the high-performance ternary ZnO-SrCO<sub>3</sub>-Co<sub>2</sub>O<sub>3</sub> varistor ceramics by optimizing the initial grain boundary environment at different sintering temperatures.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 51162-51171"},"PeriodicalIF":5.1,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chao Xiao , Ming Yin , Xindan Li , Zhong Kuang , Bin Wang , Hongjiang He , Shengquan Yu , Zhuoying Jia , Xiaoqiang Li
{"title":"Development and characterization of novel Fe2+:ZnSexS1-x solid solution laser ceramics for mid-infrared laser application","authors":"Chao Xiao , Ming Yin , Xindan Li , Zhong Kuang , Bin Wang , Hongjiang He , Shengquan Yu , Zhuoying Jia , Xiaoqiang Li","doi":"10.1016/j.ceramint.2024.10.041","DOIUrl":"10.1016/j.ceramint.2024.10.041","url":null,"abstract":"<div><div>In this study, Fe<sup>2+</sup>:ZnSe<sub>x</sub>S<sub>1-x</sub> (0.6 ≤ x ≤ 1) solid solution laser ceramics with cubic crystal structures were prepared for the first time via hot pressing sintering, using FeSe, ZnSe, and ZnS powders. The resulting ceramics exhibit a unique combination of the optical and physical properties of Fe<sup>2+</sup>:ZnSe and Fe<sup>2+</sup>:ZnS. An increase in the ZnS content led to a blueshift in the maximum absorption spectra of Fe<sup>2+</sup> ions and an enhancement in Vickers hardness. These findings suggest that Fe<sup>2+</sup>:ZnSe<sub>x</sub>S<sub>1-x</sub> solid solution ceramics could serve as promising gain media for mid-infrared solid-state lasers, offering a novel approach for the development of directly pumped mid-infrared laser systems.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 51260-51268"},"PeriodicalIF":5.1,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jianwei Gao, Xiaoqing Si, Bo Yang, Hao Yuan, Mushi Zheng, Chun Li, Junlei Qi, Jian Cao
{"title":"TiO2 containing glass sealant for protonic ceramic fuel cell applications: Microstructure, strength and stability studied in sealing of BaZr0.1Ce0.7Y0.1Yb0.1O3-δ electrolyte to Crofer 22H interconnect","authors":"Jianwei Gao, Xiaoqing Si, Bo Yang, Hao Yuan, Mushi Zheng, Chun Li, Junlei Qi, Jian Cao","doi":"10.1016/j.ceramint.2024.10.035","DOIUrl":"10.1016/j.ceramint.2024.10.035","url":null,"abstract":"<div><div>To address the challenges of protonic ceramic fuel cell (PCFC) stack sealing, a TiO<sub>2</sub>-containing alkaline silicate glass, named STKN, was utilized to seal the BaZr<sub>0.1</sub>Ce<sub>0.7</sub>Y<sub>0.1</sub>Yb<sub>0.1</sub>O<sub>3-δ</sub> (BZCYYb) electrolyte and Crofer 22 H stainless steel, achieving a sufficient bonding. The formation of the BaTiSi<sub>2</sub>O<sub>7</sub> reaction layer at the BZCYYb interface is the key to realizing effective joining. Elevating the joining temperature results in a thicker BaTiSi<sub>2</sub>O<sub>7</sub> reaction layer and a concomitant loss of the sealant. The optimal sealing parameter is determined to be 775 °C for 30 min, yielding a maximum shear strength of 20 MPa. After aging in both oxidizing and reducing atmospheres at 600 °C for 300 h, the microstructure of the joint remained stable, suggesting excellent potential for service stability of the joint.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 51207-51217"},"PeriodicalIF":5.1,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Francisco Javier Acebedo-Martínez , Paula Alejandra Baldión , Francesca Oltolina , Antonia Follenzi , Giuseppe Falini , Jorge Fernando Fernández-Sánchez , Duane Choquesillo-Lazarte , Jaime Gómez-Morales
{"title":"Biomolecule-functionalized exfoliated-graphene and graphene oxide as heteronucleants of nanocrystalline apatites to make hybrid nanocomposites with tailored mechanical, luminescent, and biological properties","authors":"Francisco Javier Acebedo-Martínez , Paula Alejandra Baldión , Francesca Oltolina , Antonia Follenzi , Giuseppe Falini , Jorge Fernando Fernández-Sánchez , Duane Choquesillo-Lazarte , Jaime Gómez-Morales","doi":"10.1016/j.ceramint.2024.10.034","DOIUrl":"10.1016/j.ceramint.2024.10.034","url":null,"abstract":"<div><div>Nanocrystalline apatite (Ap), known for its exceptional biological properties, faces limitations in hard tissue engineering due to its poor mechanical properties. To overcome this limitation, we investigated the preparation of nanocomposites through heterogeneous nucleation of calcium phosphate on exfoliated graphene (G) and graphene oxide (GO) flakes, selected for their outstanding mechanical properties. The flakes were treated (functionalized) with amino acids of varying isoelectric points—namely L-Arginine (Arg), L-Alanine (Aln) and L-Aspartic acid (Asp)— as well as citrate (Cit) molecules. Furthermore, Tb<sup>3+</sup> was incorporated into the formulations to introduce luminescence and further enrich the functionality of the composite. The synthesis was conducted using the sitting drop vapor diffusion method. Functionalized GO/Ap nanocomposites significantly improved roughness, adhesion forces and elastic modulus compared to Ap and G-based particles. GO-Asp-Ap-Tb nanocomposites exhibited the highest roughness (163.8 ± 116.2 nm), while G-Cit-Ap had the lowest (6.8 ± 5.6 nm). In terms of adhesion force, GO-Cit-Ap-Tb reached the highest value (31.06 ± 13.3 nN), while G-Arg-Ap had the lowest (3.7 ± 1.8 nN) compared to Ap (13.6 ± 3.2 nN). For the elastic modulus, GO-Aln-Ap-Tb demonstrated the greatest stiffness (3489 ± 101.01 MPa) compared to Ap (30.2 ± 6.5 MPa), while G-Aln-Ap-Tb showed the lowest (17.2 ± 8.4 MPa). Concerning their luminescence, regardless of G/Ap and GO/Ap, the relative luminescence intensities depended on the biomolecule used and decreased in the order Arg > Aln > Asp and Cit. Furthermore, G/Ap and GO/Ap nanocomposites demonstrated good biocompatibility on murine mesenchymal stem cells at low concentrations, showing cell viabilities exceeding 80 % at 0.1 μg/mL. This research offers a novel approach to enhancing the mechanical properties of apatites while preserving their good biocompatibility properties and introducing new functionalities (i.e. luminescence) in the composites, thereby expanding their range of applications in hard tissue engineering.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 51192-51206"},"PeriodicalIF":5.1,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Qingxuan Zhou , Yang Wang , Zhuoqun Han , Jia Liu , Jie Zhao , Wei Chu , Zhicheng Zhao , Jian Li , Zhiqiang Cheng , Ling Li , Futian Liu
{"title":"Effect of La2O3-MgO ratio on the microstructure and properties of Si3N4 ceramics fabricated via digital light processing","authors":"Qingxuan Zhou , Yang Wang , Zhuoqun Han , Jia Liu , Jie Zhao , Wei Chu , Zhicheng Zhao , Jian Li , Zhiqiang Cheng , Ling Li , Futian Liu","doi":"10.1016/j.ceramint.2024.10.045","DOIUrl":"10.1016/j.ceramint.2024.10.045","url":null,"abstract":"<div><div>Due to the low powder content characteristic of digital light processing in the preparation of ceramic green bodies, significant challenges arise in obtaining high-density, high-performance Si<sub>3</sub>N<sub>4</sub> ceramic. Sintering aids exert a critical influence on the densification and properties of Si<sub>3</sub>N<sub>4</sub> ceramics. To further improve the performance of 3D-printed Si<sub>3</sub>N<sub>4</sub> ceramics, Si<sub>3</sub>N<sub>4</sub> ceramics were fabricated using DLP technology combined with gas pressure sintering employing different ratios of La<sub>2</sub>O<sub>3</sub>-MgO as sintering aids. The ceramic slurries, microstructures, and ceramic performance were studied systematically. The results showed that increasing the proportion of· La<sub>2</sub>O<sub>3</sub> powder enhanced the rheological and curing properties of Si<sub>3</sub>N<sub>4</sub> ceramic slurries. Varying the La<sub>2</sub>O<sub>3</sub>-MgO ratio affected the composition of the liquid phase, leading to differences in the densification and grain growth of Si<sub>3</sub>N<sub>4</sub> ceramics. The average grain size increased with higher ratios of La<sub>2</sub>O<sub>3</sub>-MgO, and reached a maximum value of 0.91 μm with a ratio of 9:1. With the increase of the La<sub>2</sub>O<sub>3</sub>-MgO ratio, the bulk density and shrinkage rate of the ceramics initially increased and then declined. In addition, the flexural strength and fracture toughness of the ceramics peaked at a ratio of 3:7 for La<sub>2</sub>O<sub>3</sub>-MgO, measuring 577 ± 16.28 MPa and 5.84 ± 0.17 MPa m<sup>1/2</sup>, respectively. These results demonstrate that high-performance Si<sub>3</sub>N<sub>4</sub> ceramics can be effectively prepared using DLP technology by adapting the ratio of sintering additives.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 51289-51296"},"PeriodicalIF":5.1,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}